Telephone receiver



March 16 1926.

A. PIHL Nrj omen. 1

` .0l uns, Menon ro alumni. or um i To whomt may concern.'

. zen of the United States, land resident of Murray, in'the county of Salt Lake and\5)',

y pended claims.

-and useful Improvements in Telephone-Re- -phone y .adapted forwirele'ss telephony. It 1s pref-'yk armature.

our,

rnmnon nnonmn., g l i ,Y waaraan-:e4 'August a. ma, 'semin. mme. nsvea :february s, im.'

Be it known that I, ALBERT Pim., a.l citi- Two coils-7 and Spare provided, each coil be wound on a soft iron'core 9 (see Fig.

aving its inner end 10turned up for a urposehereinafter mentioned. The sides o the spool are formed by pieces 11 each having an opening 12 therein Athrough which thecore 9 may pass. When assembled two of these piecesl 11 fit on each; core 9` as clearly shown in- Figures 1 and 2, one of fthe pleces lying adjacent the upturned end 10 and the'other next to the permanentmagnet near the outer end of the core. .The core 9 and pair of pieces 11 form in effect a spool u on which the wire coil may. be wound. he outer en of each core 9 has ,a hole, 13 which registers with the hole4 5 in the permanent magnet, `the end of the core lying in a groove 14 in said magnet.

Associated witheach coil is a pole piece 15 of the form shown in Figure 5, having a central ortion 16 that overlies the coil, an inner ownturned end 17 that faces the upturned end 10 ot' the core, and an outer State of Utah, have invented certain new ceivers, of which the specification. l A

My invention relates to an improved telefreceiver. which. is particularly'y Vfollowing isl a erably of what is known as the watch case type and is very compact and simple in structure.

One object of the invention is to provide an arrangement of coils and pole pieces that will increase the sensitiveness of the receiver and eliminate a large proportion of the disturbances due to static.

Another object is to provide a diaphragm and armature so mounted and connected that a very small amount of current is necessary for their` operation.

Other ob'ects will be apparent from the following etailed descriptlon and the ap- V a hole 19 that registers with the hole 5 in the permanent magnet. The bolts 3, in addition to holding together the ring 1 and the permanent magnet 2 also pass through the holes 13 in the cores and the holes 19 in the pole pieces and therefore hold all of these parts in proper relation. Since the cores lie in the grooves 14, the flanges 18 rest directly on the permanent magnet.

Lying `between each pole piece and the correslponding coil is a piece of mica 20 or ot bolt 21 passes through the ring 1 and an angular bracket 22 has an opening fitting over said bolt so that the base of the bracket rests against the inner face of the ring 1. This bolt is threaded and a sleeve like nut 23 passes thereover and holds the bracket in place. The free end of the bracket has a pair of ears 24 and hin ed between said ears is an armature mem er 25 which extends inwardl about to the center of the diaphragm. T is armature member lies between the ends 10 of the cores 9 and the ends 17 of the pole pieces 15. At its free end the armature is connected by a link or wire connection 26v to the d1aphragm27 to which it is .fastened by a nut 28. This diaphragm may be made of mica, aluminum or other suitable ma- In the drawings:

Figure 1 is a face view of the receiver with the cover or cap removed.

Figure 2 is a bottom planv view of the receiver removed from. its inclosing case.

lFigure 3 is a section .through the case with the receiver'in side elevation.

Figure 4 is a fragmentary section through the'receiver removed from the case. v

Figure 5 is a view of themain'parts of the receiver disassembled.

Fi re 6 is a diagrammaticview showing the relation of the coils, pole .pieces and The receiver proper is inclosed within a casing composed of a cup member A and'a cover or cap B screw threaded thereonand provided withthe usual 'perforations C in its face adjacent the diaphragm. This case is provided with an opening or openings (not shown)4 for the admission of the wires or conductors. The case'will be made of an suitable non-conducting material.

o a ring 1 of suitable material is secured a ermanent magnet 2 of the general U s ape shown in Figure 5. These parts are fastened together by bolts 3 passing through holes l and the ring and registering holes 5 inthe magnet and provided bent'portion with a fiangelS provided withl er suitable insulatmgmaterial. Av

' with nuts 6 on the rear side` ofthe receiver.

terial and ts in a depression in the ring 1 as shown in Figure 4, so that it lies ilush with the face of the ring. One end o f a spring is hooked through an opemng 31 in the amature, and the other end has an e e fitting around the bolt or post 21 but oosely so that its position may be adjusted by a nut 32 threaded on said bolt. In this manner the armature may be adjusted and timed.

Binding posts 33 are fastened to the rin 1 by means of screws 34 which pass throng holes 35 in said ring and into the osts. These posts are of the split type s own in Figure 5 so that they form clamps to which the terminals may be attached without the use of set screws.

The` wire forming the coils is wound thereon in opposite directions as indicated in Figure 6, and a larger amount of wire is employed than is usually the case.. For example, with No. wire, each coil ma consist of 11,000 turns or even more. This makes the receiver very sensitive, and experiments have demonstrated that receivers constructed in this manner are much more free from disturbances due. to static than the ordinary type of receivers.

The eiciency of the device is also greatly increased by the specific arrangement of coils and pole pieces. When the device is not in use the poles are as indicated in Figure 6, the polarity being determined entirely by the permanent magnet. However, when a current is passed through the coils, each coil has a north and south end of its own. This changes the polarity of the inner ends of the core pieces 9, and gives a south pole on one core op osed to a north pole on one pole piece, w ile on the other core a north pole is opposed to a south pole on the other pole piece. This arrangement permits the use of a large amount of wire and renders the device very sensitive.

Obviously size, pro ortion, and minor details may be change without in any way departing from the spirit of my invention, which is to be regarded as limited only by the scope of the appended claims.

I claim as my invention:

1. A telephone receiver comprising a ring member, a U-shaped permanent magnet carried by said member, two coils having cores attached to the ends of the permanent magnet, pole pieces also attached at one end to' the ermanent magnet and overlying and partially surrounding the coils, an armature lying between the ends of the coils and also between the inner ends of the pole pieces and the inner ends of the cores, a pivoted support for one end of the armature, a diaphragm carried by the ring member, and means connecting the diaphragm to the other end of the armature.

member, a U-shaped permanent magnet carried by said member, two coils having cores attached at their outer ends to the ermanent magnet, said cores having angu ar inner ends, pole ieces also attached at their outer ends to t e permanent magnet overlying said coils and having angular inner ends facing the ends of the cores, a diaphra m carried by said ring, a support carried y the ring, and an armature hinged at one end to said support and connected at the other end to the diaphragm, said armature l ing between the ends of the cores and tiie ends of the pole ieces.

3. A tele member, a -shaped permanent magnet carried by said member, two reversely wound coils having cores attached at their outer ends to the permanent magnet and having angular inner ends, separate pole pieces attached at their outer ends to the permanent magnet and extending across the coils and having their inner ends facing the angular ends of the cores, and a ivoted armature mounted to lie between t e inner ends of the cores and the inner ends of the pole piees and normally out of contact with bot 4. A telephone receiver comprising a rin member, a permanent magnet, a pair o cores attached at their outer ends to the permanent magnet, coils reversel wound on said cores, a pair of pole ieces distinct from said cores attached at t eir outer ends to the permanent magnet and having free innerl ends, a diaphragm carried by the ring member, an armature connected at one end to the diaphragm and pivoted at its other end to oscillate between the free ends of the pole pieces and the free ends of the cores.

5. A telephone receiver comprising a ring member, a permanent magnet, coils having cores, pole pieces extending over said coils and having their free ends adjacent the free ends of the cores, and means for fastening the permanent magnet, cores and pole pieces to t e ring member at the same time.

6. A telephone receiver comprising a ring shaped member, a diaphragm supported thereby, a post rising from said ring member, an angular brac et through whichsaid post passes, an armature hinged at one end to the an lar bracket and connected at the other en to the diaphragm, a spring engaging the armature at one end and having aili eye at the other end loosely surrounding t e of t e sprin to tune the4 armature.

7. A telep one receiver comprising a ring member, a groove on one face at the inner edge of the ring, a diaphra fitting in said groove and lying flush Wit the face of the ring, a post rising from the other face of the ring, an angular bracket thereon, and an 2. A telephone receiver comprising a ringarmature hinged at one end to the bracket hone receiver comprising a ring,

1post, and means for adjusting the eye and connected at the other end to the diaphragm.

' 8. A telephone receiver comprising a ring member, a groove on one face \at the inner 5 edge of the ring, a diaphragm fitting in s aid groove and lying flush with the face of the ring, a post rising from the other face of the ring, a bracket thereon, an armature pivoted at one end tothe bracket and connected at the other end to the diaphragm, a spring l0 engaging the armature, and means for varyin the force exerted by said spring. A

n testimony whereof I have hereunto subscribed my name. v

ALBERT PHIL. 

